#!/usr/local/bin/python3

# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys
import hashlib

BUFSIZE = 4096

if __name__ == "__main__":
    sys.stdin  = sys.stdin.detach()
    m = hashlib.md5()
    while True:
        data = sys.stdin.read(BUFSIZE)
        if not data:
            break
        m.update(data)

    print(m.hexdigest())
